A girl readded my boyfriend after he deleted her, and he told her I asked him to delete her. Is it a red flag?

Anonymous
Before we are together, my boyfriend added a lot of girls on his social media and flirted with them. I was ok with it as we weren't a couple and I asked him to delete those mean nothing to him. Last weekend, he asked me to pick up a phone call for him (he was taking a shower), and I noticed that one girl added him back and accused him of deleting her. He explained to her that I made him delete her but he has to do it because I am the most important thing to him. I don't know whether I should bring this up to him considering I shouldn't look into his phone.
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A girl readded my boyfriend after he deleted her, and he told her I asked him to delete her. Is it a red flag?
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